Hard water in Xenia, OH
County estimate from 757 water samples in Greene County · July 2026
- OH typical
- 113 mg/L
- EPA health violations since 2016
- 1
- Softener for 3 people
- 48k grain
- Data
- County estimate
Water samples from around Xenia put hardness at about 356 mg/L (20.8 gpg), which would be very hard on the USGS scale. Treat this as a rough guide: it is the median of 757 samples taken across Greene County, mostly wells and streams, not a test of Xenia's treated tap water.
Xenia sits 243 mg/L above the typical Ohio figure of 113. None of the 10 nearest cities we track has harder water. The range nearby runs from 139 mg/L in Bellbrook to 232 in Fairborn.
What 356 mg/L means at home
Scale forms fast here. Kettles and coffee makers need regular descaling, and showerheads clog unless you clean them.
Tank water heaters collect mineral sediment that insulates the water from the burner, so flushing the tank matters more than usual.
Dishes and glass shower doors spot easily. Soap scum and a dull film on hair or laundry are common complaints.
Hardness is not a health problem, and EPA sets no limit for it. It is a matter of scale and soap.
What to do about it
At 356 mg/L most of the trouble is scale, and only a few things deal with it.
Ion-exchange water softener
The standard whole-house fix. It swaps calcium and magnesium for sodium or potassium and needs salt plus a drain. Size it with the calculator below.
Salt-free conditioner
No salt and no drain line. It changes how minerals form scale instead of removing them, so water still tests hard.
Reverse osmosis or carbon filter
Under-sink reverse osmosis removes minerals from drinking water only. Plain carbon filters improve taste but do not soften.
3 people × 75 gallons a day × 20.8 gpg = 4,684 grains a day. A 48,000-grain unit regenerates about every 10 days.
EPA record for Xenia's water system
1 health-based violation since 2016
Serves about 29,000 people from groundwater.
- Health-based
- 1
- Monitoring or reporting
- 0
- Open now
- 0
EPA lists this system as serving Xenia.
| Contaminant or rule | Violations | Period | Status |
|---|---|---|---|
| Total Coliform Rulebacteria | 1 | 2016 | Resolved |
Health-based means a contaminant above its legal limit or a missed treatment step. Monitoring and reporting violations are late or missing tests and notices. Source: EPA ECHO, 2026Q3 export, violations with periods starting 2016 or later. Full EPA record.
Questions
Is Xenia water hard?
Yes. It measures about 356 mg/L (20.8 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Xenia in grains per gallon?
About 20.8 gpg. One grain per gallon equals 17.1 mg/L, so 356 mg/L divided by 17.1 gives 20.8.
What size water softener do I need in Xenia?
For 3 people using 75 gallons each per day, 20.8 gpg works out to about 4,684 grains a day. A 48,000-grain softener covers that with a regeneration about every 10 days.
Has the Xenia water system had EPA violations?
EPA records show 1 health-based violation for Xenia City PWS since 2016, involving Total Coliform Rule.
Nearby cities
- Beavercreek149 mg/LHard
- Bellbrook139 mg/LHard
- Fairborn232 mg/LVery hard
- Kettering147 mg/LHard
- Centerville142 mg/LHard
- Riverside149 mg/LHard
- Oakwood148 mg/LHard
- Huber Heights155 mg/LHard
- Dayton147 mg/LHard
- Moraine147 mg/LHard
Hardness data: TapWaterData US Water Hardness (county estimate, July 4, 2026), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.